Who is likely the father to be the father?

I had unprotected sex with my boyfriend Nov 29th, 30th as well as the morning of Dec 1st; he always finishes inside of me. We got into a huge argument and I ended up sleeping with my ex Dec 2 at about 2 in the morning which was unprotected and he also finished inside of me. I then had sex with my boyfriend again on Dec 3rd. Yes I am ashamed of myself. However, my Dr says my LMP (according to the gestational ultrasound measurement) was Nov 16. My conception date is between Nov 30th-Dec 4th. Which guy am I most likely pregnant by? Please help as best you can.

When I said "by the dates," I meant, by a count like x weeks x days. If the ultrasound was early enough in your pregnancy , you might be able to do some figuring if you have an estimated due date (a calendar date, like May 30, not a number of weeks). But that method is only useful if the doctor looked at the embryo on the ultrasound and then gave you a due date based only on the measurements of the embryo. Him looking at the embryo on the ultrasound and giving you a number of weeks since your last period is not the best way to do it.

Well, your boyfriend has the edge, but only by 2 days, and a ninth-week ultrasound, if used to try to determine when you got pregnant, has a margin for error of more than 2 days. Not much more, though.

I should add, your boyfriend has the edge but only by two days *if* the estimated due date the doctor gave you from the measurements on the ultrasound was August 23. If the doctor said a different due date, I would be interested to hear it.

I had unprotected sex with my boyfriend Nov 29th, 30th as well as the morning of Dec 1st; he always finishes inside of me. We got into a huge argument and I ended up sleeping with my ex Dec 2 at about 2 in the morning which was unprotected and he also finished inside of me. I then had sex with my boyfriend again on Dec 3rd. Yes I am ashamed of myself. However, my Dr says my LMP (according to the gestational ultrasound measurement) was Nov 16. My conception date is between Nov 30th-Dec 4th. Which guy am I most likely pregnant by? Please help as best you can.

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